package cn.iocoder.yudao.module.system.service.teacherdashboard;

import cn.iocoder.yudao.module.system.controller.admin.teacherdashboard.vo.TeacherDashboardRespVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;
import java.util.concurrent.CompletableFuture;

/**
 * 教师看板异步处理服务
 * 用于异步处理非关键数据，提升响应速度
 *
 * @author 芋道源码
 */
@Service
@Slf4j
public class AsyncTeacherDashboardService {

    @Resource
    private TeacherDashboardService teacherDashboardService;

    @Resource
    private TeacherDashboardCacheService cacheService;

    // ==================== 异步数据加载方法 ====================

    /**
     * 异步获取对比分析数据
     */
    @Async("dashboardExecutor")
    public CompletableFuture<TeacherDashboardRespVO.ComparisonAnalysis> getComparisonAnalysisAsync(
            Long classId, Long examId) {
        
        log.debug("开始异步获取对比分析数据，classId: {}, examId: {}", classId, examId);
        
        try {
            // 这里需要调用原有的对比分析方法
            // 由于原方法是private，这里提供一个示例实现
            TeacherDashboardRespVO.ComparisonAnalysis analysis = createDefaultComparison();
            
            log.debug("异步获取对比分析数据完成，classId: {}, examId: {}", classId, examId);
            return CompletableFuture.completedFuture(analysis);
            
        } catch (Exception e) {
            log.error("异步获取对比分析数据失败，classId: {}, examId: {}, error: {}", classId, examId, e.getMessage(), e);
            return CompletableFuture.completedFuture(createDefaultComparison());
        }
    }

    /**
     * 异步获取教学建议
     */
    @Async("dashboardExecutor")
    public CompletableFuture<List<TeacherDashboardRespVO.TeachingSuggestion>> getTeachingSuggestionsAsync(
            Long classId, Long examId) {
        
        log.debug("开始异步获取教学建议，classId: {}, examId: {}", classId, examId);
        
        try {
            // 这里需要调用原有的教学建议生成方法
            List<TeacherDashboardRespVO.TeachingSuggestion> suggestions = createDefaultTeachingSuggestions();
            
            log.debug("异步获取教学建议完成，classId: {}, examId: {}, count: {}", 
                     classId, examId, suggestions.size());
            return CompletableFuture.completedFuture(suggestions);
            
        } catch (Exception e) {
            log.error("异步获取教学建议失败，classId: {}, examId: {}, error: {}", classId, examId, e.getMessage(), e);
            return CompletableFuture.completedFuture(createDefaultTeachingSuggestions());
        }
    }

    /**
     * 异步获取升学分析数据
     */
    @Async("dashboardExecutor")
    public CompletableFuture<TeacherDashboardRespVO.AdmissionAnalysis> getAdmissionAnalysisAsync(
            Long classId, Long examId) {
        
        log.debug("开始异步获取升学分析数据，classId: {}, examId: {}", classId, examId);
        
        try {
            // 这里需要调用原有的升学分析方法
            TeacherDashboardRespVO.AdmissionAnalysis analysis = createDefaultAdmissionAnalysis();
            
            log.debug("异步获取升学分析数据完成，classId: {}, examId: {}", classId, examId);
            return CompletableFuture.completedFuture(analysis);
            
        } catch (Exception e) {
            log.error("异步获取升学分析数据失败，classId: {}, examId: {}, error: {}", classId, examId, e.getMessage(), e);
            return CompletableFuture.completedFuture(createDefaultAdmissionAnalysis());
        }
    }

    /**
     * 异步获取重点关注学生
     */
    @Async("dashboardExecutor")
    public CompletableFuture<List<TeacherDashboardRespVO.FocusStudent>> getFocusStudentsAsync(
            Long classId, Long examId) {
        
        log.debug("开始异步获取重点关注学生，classId: {}, examId: {}", classId, examId);
        
        try {
            // 这里需要调用原有的重点关注学生查询方法
            List<TeacherDashboardRespVO.FocusStudent> focusStudents = List.of();
            
            log.debug("异步获取重点关注学生完成，classId: {}, examId: {}, count: {}", 
                     classId, examId, focusStudents.size());
            return CompletableFuture.completedFuture(focusStudents);
            
        } catch (Exception e) {
            log.error("异步获取重点关注学生失败，classId: {}, examId: {}, error: {}", classId, examId, e.getMessage(), e);
            return CompletableFuture.completedFuture(List.of());
        }
    }

    // ==================== 异步缓存预热方法 ====================

    /**
     * 异步预热考试统计缓存
     */
    @Async("dashboardExecutor")
    public CompletableFuture<Void> preloadExamStatisticsAsync(Long examId) {
        log.debug("开始异步预热考试统计缓存，examId: {}", examId);
        
        try {
            // 检查缓存是否已存在
            if (cacheService.getExamStatistics(examId) == null) {
                // 这里需要调用数据库查询方法获取统计数据
                // Map<String, Object> stats = examScoreMapper.selectBatchStatistics(examId);
                // cacheService.cacheExamStatistics(examId, stats);
                log.debug("考试统计缓存预热完成，examId: {}", examId);
            } else {
                log.debug("考试统计缓存已存在，无需预热，examId: {}", examId);
            }
            
        } catch (Exception e) {
            log.error("异步预热考试统计缓存失败，examId: {}, error: {}", examId, e.getMessage(), e);
        }
        
        return CompletableFuture.completedFuture(null);
    }

    /**
     * 异步预热班级排名缓存
     */
    @Async("dashboardExecutor")
    public CompletableFuture<Void> preloadClassRankingAsync(Long classId, Long examId) {
        log.debug("开始异步预热班级排名缓存，classId: {}, examId: {}", classId, examId);
        
        try {
            // 检查缓存是否已存在
            if (cacheService.getClassRanking(classId, examId) == null) {
                // 这里需要调用数据库查询方法获取排名数据
                // List<Map<String, Object>> ranking = examScoreMapper.selectOptimizedClassTopStudents(classId, examId, 50);
                // cacheService.cacheClassRanking(classId, examId, ranking);
                log.debug("班级排名缓存预热完成，classId: {}, examId: {}", classId, examId);
            } else {
                log.debug("班级排名缓存已存在，无需预热，classId: {}, examId: {}", classId, examId);
            }
            
        } catch (Exception e) {
            log.error("异步预热班级排名缓存失败，classId: {}, examId: {}, error: {}", classId, examId, e.getMessage(), e);
        }
        
        return CompletableFuture.completedFuture(null);
    }

    /**
     * 异步预热科目统计缓存
     */
    @Async("dashboardExecutor")
    public CompletableFuture<Void> preloadSubjectStatisticsAsync(Long examId) {
        log.debug("开始异步预热科目统计缓存，examId: {}", examId);
        
        try {
            // 检查缓存是否已存在
            if (cacheService.getSubjectStatistics(examId) == null) {
                // 这里需要调用数据库查询方法获取科目统计数据
                // List<Map<String, Object>> stats = examScoreMapper.selectBatchSubjectStatistics(examId);
                // cacheService.cacheSubjectStatistics(examId, stats);
                log.debug("科目统计缓存预热完成，examId: {}", examId);
            } else {
                log.debug("科目统计缓存已存在，无需预热，examId: {}", examId);
            }
            
        } catch (Exception e) {
            log.error("异步预热科目统计缓存失败，examId: {}, error: {}", examId, e.getMessage(), e);
        }
        
        return CompletableFuture.completedFuture(null);
    }

    // ==================== 异步数据更新方法 ====================

    /**
     * 异步更新排名数据
     */
    @Async("dashboardExecutor")
    public CompletableFuture<Void> updateRankingsAsync(Long examId) {
        log.debug("开始异步更新排名数据，examId: {}", examId);
        
        try {
            // 这里需要调用排名更新的存储过程或方法
            // examScoreMapper.updateClassRankByExamId(examId);
            // examScoreMapper.updateGradeRankByExamId(examId);
            
            // 清除相关缓存
            cacheService.invalidateExamCache(examId);
            
            log.debug("异步更新排名数据完成，examId: {}", examId);
            
        } catch (Exception e) {
            log.error("异步更新排名数据失败，examId: {}, error: {}", examId, e.getMessage(), e);
        }
        
        return CompletableFuture.completedFuture(null);
    }

    /**
     * 异步批量预热缓存
     */
    @Async("dashboardExecutor")
    public CompletableFuture<Void> batchPreloadCacheAsync(List<Long> examIds, List<Long> classIds) {
        log.debug("开始异步批量预热缓存，examIds: {}, classIds: {}", examIds, classIds);
        
        try {
            // 预热考试统计缓存
            for (Long examId : examIds) {
                preloadExamStatisticsAsync(examId);
                preloadSubjectStatisticsAsync(examId);
                
                // 预热班级排名缓存
                for (Long classId : classIds) {
                    preloadClassRankingAsync(classId, examId);
                }
            }
            
            log.debug("异步批量预热缓存完成，examIds: {}, classIds: {}", examIds, classIds);
            
        } catch (Exception e) {
            log.error("异步批量预热缓存失败，examIds: {}, classIds: {}, error: {}", examIds, classIds, e.getMessage(), e);
        }
        
        return CompletableFuture.completedFuture(null);
    }

    // ==================== 默认数据创建方法 ====================

    /**
     * 创建默认对比分析数据
     */
    private TeacherDashboardRespVO.ComparisonAnalysis createDefaultComparison() {
        TeacherDashboardRespVO.ComparisonAnalysis comparison = new TeacherDashboardRespVO.ComparisonAnalysis();
        // 设置默认值
        return comparison;
    }

    /**
     * 创建默认教学建议
     */
    private List<TeacherDashboardRespVO.TeachingSuggestion> createDefaultTeachingSuggestions() {
        return List.of();
    }

    /**
     * 创建默认升学分析数据
     */
    private TeacherDashboardRespVO.AdmissionAnalysis createDefaultAdmissionAnalysis() {
        TeacherDashboardRespVO.AdmissionAnalysis analysis = new TeacherDashboardRespVO.AdmissionAnalysis();
        // 设置默认值
        return analysis;
    }

    // ==================== 异步任务监控方法 ====================

    /**
     * 获取异步任务执行统计
     */
    public CompletableFuture<String> getAsyncTaskStatistics() {
        return CompletableFuture.supplyAsync(() -> {
            try {
                // 这里可以添加异步任务执行统计逻辑
                return "异步任务统计信息";
            } catch (Exception e) {
                log.error("获取异步任务统计失败，error: {}", e.getMessage(), e);
                return "获取统计信息失败: " + e.getMessage();
            }
        });
    }
}